package com.youdianda.interceptor;

import com.youdianda.context.BaseContext;
import com.youdianda.util.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        log.info(request.getRequestURI());
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取token
        String token = request.getHeader("x-token");
        if (token==null){
            token = request.getHeader("token");
            if (token == null){
                response.setStatus(401);
                return false;
            }
        }

        //2、校验token是否有效
        Claims claimsBody = JwtUtil.getClaimsBody(token);
        if (claimsBody == null){
            response.setStatus(401);
            return false;
        }
        int i = JwtUtil.verifyToken(claimsBody);
        if (i==1||i==2){
            response.setStatus(401);
            return false;
        }else {
            BaseContext.setCurrentId(Long.valueOf(claimsBody.get("id").toString()));
            return true;
        }
    }
}
